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Improve handling of too short BLE time update messages

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This commit is contained in:
swevictor 2023-10-06 14:02:04 +02:00
parent 75306827ae
commit 1f2c2df5ca
1 changed files with 21 additions and 8 deletions
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29
plejd/PlejdBLEHandler.js
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@ -39,6 +39,9 @@ const BLUEZ_DEVICE_ID = 'org.bluez.Device1';
const GATT_SERVICE_ID = 'org.bluez.GattService1';
const GATT_CHRC_ID = 'org.bluez.GattCharacteristic1';
const PAYLOAD_POSITION_OFFSET = 5;
const DIM_LEVEL_POSITION_OFFSET = 7;
const delay = (timeout) => new Promise((resolve) => setTimeout(resolve, timeout));
class PlejBLEHandler extends EventEmitter {
@ -804,7 +807,7 @@ class PlejBLEHandler extends EventEmitter {
const encryptedData = value.value;
const decoded = this._encryptDecrypt(this.cryptoKey, this.plejdService.addr, encryptedData);
if (decoded.length < 5) {
if (decoded.length < PAYLOAD_POSITION_OFFSET) {
if (Logger.shouldLog('debug')) {
// decoded.toString() could potentially be expensive
logger.verbose(`Too short raw event ignored: ${decoded.toString('hex')}`);
@ -817,13 +820,13 @@ class PlejBLEHandler extends EventEmitter {
// Bytes 2-3 is Command/Request
const cmd = decoded.readUInt16BE(3);
const state = decoded.length > 5 ? decoded.readUInt8(5) : 0;
const state = decoded.length > PAYLOAD_POSITION_OFFSET ? decoded.readUInt8(PAYLOAD_POSITION_OFFSET) : 0;
const dim = decoded.length > 7 ? decoded.readUInt8(7) : 0;
const dim = decoded.length > DIM_LEVEL_POSITION_OFFSET ? decoded.readUInt8(DIM_LEVEL_POSITION_OFFSET) : 0;
if (Logger.shouldLog('silly')) {
// Full dim level is 2 bytes, we could potentially use this
const dimFull = decoded.length > 7 ? decoded.readUInt16LE(6) : 0;
const dimFull = decoded.length > DIM_LEVEL_POSITION_OFFSET ? decoded.readUInt16LE(DIM_LEVEL_POSITION_OFFSET - 1) : 0;
logger.silly(`Dim: ${dim.toString(16)}, full precision: ${dimFull.toString(16)}`);
}
@ -874,12 +877,22 @@ class PlejBLEHandler extends EventEmitter {
data = { sceneId: scene.uniqueId };
this.emit(PlejBLEHandler.EVENTS.commandReceived, outputUniqueId, command, data);
} else if (cmd === BLE_CMD_TIME_UPDATE) {
if (decoded.length < PAYLOAD_POSITION_OFFSET + 4) {
if (Logger.shouldLog('debug')) {
// decoded.toString() could potentially be expensive
logger.verbose(`Too short time update event ignored: ${decoded.toString('hex')}`);
}
// ignore the notification since too small
return;
}
const now = new Date();
// Guess Plejd timezone based on HA time zone
const offsetSecondsGuess = now.getTimezoneOffset() * 60 + 250; // Todo: 4 min off
// Plejd reports local unix timestamp adjust to local time zone
const plejdTimestampUTC = (decoded.readInt32LE(5) + offsetSecondsGuess) * 1000;
const plejdTimestampUTC = (decoded.readInt32LE(PAYLOAD_POSITION_OFFSET) + offsetSecondsGuess) * 1000;
const diffSeconds = Math.round((plejdTimestampUTC - now.getTime()) / 1000);
if (
bleOutputAddress !== BLE_BROADCAST_DEVICE_ID ||
@ -902,7 +915,7 @@ class PlejBLEHandler extends EventEmitter {
this.connectedDeviceId,
BLE_CMD_TIME_UPDATE,
10,
(pl) => pl.writeInt32LE(Math.trunc(newLocalTimestamp), 5),
(pl) => pl.writeInt32LE(Math.trunc(newLocalTimestamp), PAYLOAD_POSITION_OFFSET),
);
try {
this._write(payload);
@ -954,8 +967,8 @@ class PlejBLEHandler extends EventEmitter {
return this._createPayload(
bleOutputAddress,
command,
5 + Math.ceil(hexDataString.length / 2),
(payload) => payload.write(hexDataString, 5, 'hex'),
PAYLOAD_POSITION_OFFSET + Math.ceil(hexDataString.length / 2),
(payload) => payload.write(hexDataString, PAYLOAD_POSITION_OFFSET, 'hex'),
requestResponseCommand,
);
}